Improvement in steam-boilers



G. D. DA LY. Steam-Boiler.

No. 214,631. j

Patented April 22,1879.

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UNITED STATES PATENT OFFIoE.

GUY D. DALY, or FLATBUSH, NEW YORK.-

IMPROVEMENT IN STEAM-BOILERS.

Specification forming part of Letters Patent N 0. 214,63], dated April 22, 1879; application filed February 10, 1879.

To all whom it may concern:

Be it known that I, GUY D. DALY, of Flatbush, in the county of Kings and State of New York, have invented a new and Improved Steam-Boiler, of which the following is a specification.

Figure l of the drawings represents a sectional elevation of the boiler; Fig. 2, a crosssection through w m.

The object of this invention is to provide a steam boiler of superior economy and efficiency, cheap and simple in construction, easy to repair, economical of fuel, quick to generate steam, and possessing elements of safety lacking in other boilers.

The boiler is of that type called a firebox boiler, and is to be set in an upright position.

Within the shell are contained the ash pit A, the fire-chamber B, which extends upward from grate surface a to crown sheet I), the water-space or boiler proper, O, and the steamdrum D.

A special object of this invention is to provide unusual facilities for the circulation of the water and a maximum amount of heatingsurface, and these points are secured as follows: The feed-wateris forced into the boiler, by pump or otherwise, through feed-pipe E. After it has attained a certain depth over the crownsheet, the surplus flows down, through the stop-cocks F F, into the pipes or tubes G I G, that in coils or zigzags partially fill the firechamber, and thence, through the cooks H H, into the outside tubes or pipes, I I, which should be jacketed to prevent loss of heat and condensation, back to the water-space.

In the drawings but one pipe system is shown complete 5 but in practice two or more systems are used, and the cooks H H are ordinarily arranged on a horizontal rather than on a vertical line.

The cocks F F are so arranged or constructed that while the water from above may flow through them into the tubes G G, upward pressure from the tubes at once closes them, or rather they remain open so long as the pressure in G exceeds in any degree the pressure in the tubes, and close instantly when the pressures are reversed; and so, also, of the creases the pressure therein as to overbalance that in 0, close F F against further delivery of water, and open H H for relief. The pressure in the tubes G Gr being thus reduced, wa-

ter again flows into them through cocks F F,

to have its temperature increased, and to be ejected in the same way, and thus the circulation-the action and reaction-continues so long as the fires are kept up.

I am well aware that without the valves this arrangement of tubes in connection with the waterspace would be of doubtful utility, if not altogether useless and dangerous, especially if very hot fires were maintained, for with even pressure throughout the tubes and water-space the circulation, which would always be sluggish, would become more feeble with increase of temperature.

The arrangement herein shown, on the contrary, compels a free circulation that must increase with each increment of heat.

To decrease the commotion caused by the return of the water and steam from tubes G G to the water-space O, I bend the tubes I I down to within a few inches of the crownsheet.

It is obvious that upon the size of the tubes will depend the extent of heating-surface and the extent of the subdivision of the water exposed to the heat, and that smaller tubes can be used advantageously in this construction of boiler than could be practicable in any other. It will be seen, too, that any one system of tubes may be removed for repairs and replaced again most expeditiously.

The crown-sheet of the boiler being so far removed from the fire is less liable to injury than is the case in ordinary boilers.

The extent and disposition of the heatingsurface assure great economy of fuel, and the rapid circulation in the tubes will keep them 2. In combination with the water-space of a steam-boiler, one or more circulating systems each consisting of cock F, tube G, cock H, and tube I, constructed and arranged substantially as herein shown and described.

GUY D. DAIJY.

Wi tn esses O. SEDGWIOK, I. I. STORER. 

